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Hello Damian, I can mention here one issue. When we plot a graph as you have attached here for Rx power at the Rx input vs EVM (%). it is clearly noticeable that for lesser received power the EVM is less but according to me “for lesser received power the EVM should be more” i.e. for any system for lesser received power the EVM should be more and for greater Rx power the EVM should be less. (point to be noted that here I have considered that there is no fiber non-linearity because for much higher power the case will be opposite as I have mentioned above i.e. after a certain value of larger Rx power the EVM also start to increase)

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